LiB （lithium-ion battery） has become serious concern for energy management systems, especially in Japan, where the argument on a nuclear power plant problem is active. Including reuse of LiB, long-term use is expect...LiB （lithium-ion battery） has become serious concern for energy management systems, especially in Japan, where the argument on a nuclear power plant problem is active. Including reuse of LiB, long-term use is expected, however, method to ensure LiB life has not been developed thus the users of LiB are forced to accept the uncertainty of LiB life. Therefore this study suggests an evaluation method for LiB life using degradation experimental data. This method has three elements, defining indexes, preparing degradation speed database from the result of experiment, and setting up the use patterns of LiB. In order to be usable under non-experimental conditions, degradation speed database has the data in all conditions by complementing the experimental result. Finally, this evaluation model was verified by comparing model estimates and the experimental measurements.展开更多
This paper proposes a moving ratio test, which is a modified version of ratio test by involving a bandwidth parameter, to detect multiple changes in persistence, and to determine the direction of switch. The asymptoti...This paper proposes a moving ratio test, which is a modified version of ratio test by involving a bandwidth parameter, to detect multiple changes in persistence, and to determine the direction of switch. The asymptotic distribution as well as its consistency are established. In order to estimate the change points, the authors propose a two step estimate approach. Simulations illustrate the performance of the test and estimate procedures in finite samples. An application to the analysis of Sweden/US foreign exchange rate demonstrates the validity of the procedure in practice.展开更多
文摘LiB （lithium-ion battery） has become serious concern for energy management systems, especially in Japan, where the argument on a nuclear power plant problem is active. Including reuse of LiB, long-term use is expected, however, method to ensure LiB life has not been developed thus the users of LiB are forced to accept the uncertainty of LiB life. Therefore this study suggests an evaluation method for LiB life using degradation experimental data. This method has three elements, defining indexes, preparing degradation speed database from the result of experiment, and setting up the use patterns of LiB. In order to be usable under non-experimental conditions, degradation speed database has the data in all conditions by complementing the experimental result. Finally, this evaluation model was verified by comparing model estimates and the experimental measurements.
基金supported by the National Natural Science Foundation of China under Grant Nos.61065009 and 60972150
文摘This paper proposes a moving ratio test, which is a modified version of ratio test by involving a bandwidth parameter, to detect multiple changes in persistence, and to determine the direction of switch. The asymptotic distribution as well as its consistency are established. In order to estimate the change points, the authors propose a two step estimate approach. Simulations illustrate the performance of the test and estimate procedures in finite samples. An application to the analysis of Sweden/US foreign exchange rate demonstrates the validity of the procedure in practice.
